Rock-drill.



C. A. HULTQUIST.

ROGK DRILL.

` APPLlcATIoH rmzn um. 1n, 1m. l 1 ,040,544, Patented Get. 8, 1912.

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UNITE@ lfsittlli PATIENT @FINCK CHARLESA.. HULTQUIST, OF LDS ANGELES, CALIFORNIA.

ROCK-DRILL.

Specification of Letters Patent.

Application filed February 19, 1912.

Patented Oct. 5,1912.

Serial No. 678,700.

To all whom it may concern Be it known that I, Cnam/ns A. Home uUis'r, a citizen ot the United States, residing' at Los Angeles, in the county of Los Angoles and State of California, have invented new and uset'ul Improvements in Rock- Drills, ot' which the t'i'illowing is a specification.

In a previous patent of mine, No. 978,586, December 13th, 1910, I have shown a rock drill in which the valve is supplied with the operating fluid through a swivel which has a revoluble movement with respect to the drill, which permits swinging the supply pipe to either side of the drill without detaehing,- the pipe, and the object oit' the pres ent invention is to provide an improved bearingI for the swivel.

JAnother object is to provide a strainer in the swivel to prevent foreign substances from entering the valve with the fluid.

Referring to the drawings: Iiigure 1 is a longitudinal sectional View through a portion ot the drill at the valve and swivel. Fig. 2 is a similar view showingl a slightly modified :form et swivel.

In the previous patent referred to, the swivel was hollow and at its inner end had a bearing directly in the main castingg` ot the drill, while the outer end oit the swivel had a bearing` on a stem rwhich projected from the valve casing, in consequence ot' which not only was the outer end not supported firmly enough and there was also necessarily a joint at the point where the stem passed through the end ot' the swivel, which was apt to leak. In the present invention I support the outer end ot the swivel in a solid member directly connected with the drill casting, so that the swivel will loe more lirmly supported and the present construe tion shows elimination of the joint at the outer end which previously extended into the swivel and thereby positively avoids leakage at this point.

In the form shown in Fig. 1, 1 designates the swivel havingv a cent-ral chamber 2. The inner portion of the swivel has a seat at 3 and is revoluble in the casing 1 which contains the valve mechanism designated in general 5. A plug 6 screwed in the casing' 4lretains the valve mechanism. The swivel 1 at its other end has a bearin` on a bushing 7 which is mounted in a bracket 8 which projects Yfrom the main body portion of the drill, the bushing,` 7 being prevented -from rotation by a key t). A holt1()passesthrough the bushing 7 and is screwed into the end of the plug,y and servos to hold the swivel with a close tit at its two bearing surit'accs 3 and 11, preventing leakage. The bushing` 7 being supported in the bracket S furnishes an adequate support tor the outer end ot the swivel so that t-he swivel is firmly mounted and capable of enduring severe strains when called upon to do so in use. The valve casing' f1 is provided with a passage 1t) establishing communication tor a central port 20 trom the valve to the space 17 above the member 1, passage 1S) opening' :into said space 17 at 1S, for admitting' air to said space. The inner end otE the swivel is provided with a perforated wall 12 which prevents 'foreign substances trom enterintgl the valve.

ln lt 2 the swivel 1 has a bearing' 3a as in the previous form, at its inner end, but at its outer end has a solid wall 123 which is recessed to torni a seat tor a block 14. which is mounted in the bracket Sl. The block ht is held against the swivel and the swivel kept with a proper working tit by a screw 15 which extends through a bushing` 16 screwed into the bracket: S. In this i'orm the wall 13 positively prevents leakage at the outer end ot the swivel as the holtl 1() is dispensed with and also the joint 11 so that the only point ot" possible leakage is at the seat 3ft. i

In both forms it will be noted that the swivel has an inner bearingl in the main easting oit the drill and that the outer cud ot the swivel has a bearing` on a member directly supported hy the main castingl o't the drill at that point so that in both cases this advantageous iteature is present.

What I claim is:

1. In a rock drill, valve mechanism therefor, means t'or intrmlucino,r air to said valve mechanism comprising a swivel, a bracket on the drill, means sup ported by the bracket for revolubly supporting` one end of the swivel, and means on the drill for revolubly supporting;l the other end oi the swivel.

2. In a rock drill, valve mechanism therefor, means for introducing;l air to said valve mechanism comprising a swivel, a bracket on the drill, means supported by the bracket for revolubly supporting` one end oil the swivel, and means on the drill tor revolubly supporting the other end oit the swivel, the

swivel having a perforated Wall through anism, means on the rock drill revolubly 15 which the fluid passes to the valve mechsupporting one end ofthe swivel, a bracketY anism. on the drill, a bushing screwed in the bracket,

.3. In a rock drill, Valve mechanism, a a Screw extending through the bushing, a Y l 5 swivel for admitting air to the Valve mech non-revoluble block in the bracket against anism, means 0n the rock drill revolubly supwhich the screw bears, said block revolubly 2o porting one end of the swivel, a bracket on supporting the other end of the swivel.

the drill, a bushing screwed in the bracket, a In testimony whereof, I have hereunto set screw extending through the bushing,ablock my hand at Los Angeles, California, this 1o in the bracket aga-inst Which the screw bears, 12th day of February, 1912.

said block revolubly supporting the other Y CHARLES A. HULTQUIST. end of the swivel. In presence of- 4. In a rock drill, Valve mechanism, a ARTHUR P. KNIGHT, swivel for admitting air to the Valve meoh- GLADYS RUSSELL.

Copies of this patent may be obtained for ve cents each, by addressing the Commissioner of Patents, Washington, DJG. 

